1 Features
1• Average Temperature Coefficient 50 ppm/°C
• Temperature Compensated for Operation Over
the Full Temperature Range
• Programmable Output Voltage
• Fast Turnon Response
• Low-Output Noise
• Low-Dynamic Output Impedance
• Available in Space-Saving SOIC-8, SOT-23, and
TO-92 Packages

2 Applications
• Adjustable Voltage or Current Linear and
Switching Power Supplies
• Voltage Monitoring
• Current Source and Sink Circuits
• Circuits Requiring Precision References
• Zener Diode Replacements

3 Description
The LM431 is a 3-terminal adjustable shunt regulator
with ensured temperature stability over the entire temperature range of operation. The output voltage
may be set at any level greater than 2.5 V (VREF) up
to 36 V merely by selecting two external resistors that
act as a voltage divided network. Due to the sharp
turnon characteristics this device is an excellent replacement for many Zener diode applications.
The LM431 is available in space-saving SOIC-8, SOT-23, and TO-92 packages.